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Light bulbs are typically rated by their power dissipation when operated at a given voltage. Which of the following light bulbs has the largest current through it when operated at the voltage for which it's rated?

(a) 3.2 W, 6.0 V
(b) 24 W, 12 V
(c) 16 W, 18 V
(d) 32 W, 24 V

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Amal Jeeva
Amal JeevaLv10
5 Oct 2020

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

1. When a light bulb is rated at 60 W, it means that

A. each second, the bulb converts 60 J of electrical energy to heat and light.

B. the bulb loses 60 W of potential energy each second.

C. current is traveling at 60 m/s through the filament.

D. the bulb uses 60 J of power when it is lit.

 

The molecules of a gas are much farther apart than molecules in a solid or liquid.

True
False

5) A 1500 W electric hair dryer is designed to work in the UnitedStates, where the AC voltage is 120 V rms. What power is dissipatedin the hair dryer when it is plugged into a 240 V rms socket inEurope ?


10) A hair dryer has a power rating of 1200 W at 120 V rms. Assumethe hair dryer circuit contains only resistance.

a) What is the resistance of the heating element ?

b) What is the rms current drawn by the hair dryer ?

c) What is the maximum instantaneous power that the resistance mustwithstand ?

A household's electric bill is shown below. Use this electric billto answer the following questions except for D. For D you'll needto actually go around your home and count up the total wattage ofall the light bulbs you are using.

NOTE: Your answers for A, B, & C must be exact to be counted ascorrect.WebAssign will check your answer for the correct number ofsignificant figures.

Service From: NOV 20 to DEC 18 (28 days)
PREVIOUS BILL AMOUNT PAYMENTS
(-) NEW CHARGES (+) ADJUSTMENTS (+ OR -) AMOUNT DUE (=)
$262.61 $262.61 $114.09 $5.71 $119.80

PREVIOUS METER READING PRESENT METER READING TOTAL USAGERESIDENTIAL SERVICE SALES TAX (3%) NEW CHARGES
51517 kWh 52394 kWh 877 kWh $110.77 $3.32 $114.09


A.) State the number of days in the billing cycle for the electricbill shown above.

Answer:________ days

B.) State the number of kWh used in this cycle.

Answer:________ kWh

C.) State how much the household was charged for energy used inthis cycle. Do not include taxes nor other fees.

Answer: $__________

D.) State the total wattage of all the light bulbs in yourhome.

Answer:________ W

E.) What is the cost per kWh? Do not include taxes nor otherfees.

Answer:_________ $/kWh

Answer:_________ ¢/kWh

F.) In joules, how much energy did this household use?

Answer:__________ J

G.) What was this household's average power consumption? Expressyour answer in both W and kW.

Answer:___________W

Answer:___________ kW

H.) The electric company has seen to it that each home is providedwith roughly 120 V at each electrical outlet (there are a few thatare 240 V but we'll ignore those). Using this fact and yourprevious answer (the power in W) determine the average current thatwas running through this house.


Answer:___________ A

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